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Weight not related to stronger bones

Fatter men have smaller, thinner bones, while those with more lean mass have larger, denser skeletons.

Weight not related to stronger bones

Fatter men have smaller, thinner bones, while those with more lean mass have larger, denser skeletons.

High body mass index (BMI) has been thought to protect both men and women against the bone-thinning disease osteoporosis, while being thin boosts a person's likelihood of fractures. The idea behind the theory was that extra weight stresses the bone, stimulating the formation of new bone tissue.

To investigate this issue, researchers looked at bone density and volume, as well as lean and fat mass, in 768 Belgian men aged between 25 and 45 years, including 296 pairs of brothers.

After the researchers adjusted for weight, it was found that men's bone mass and volume fell steadily as their percentage of fat mass increased, while bone size rose in tandem with lean mass. Fat in the trunk area had a stronger influence on bone size than fat on the arms and legs.

The above findings indicate that lean mass is the major determinant of bone size, providing further evidence that bone size is adapted to the dynamic load imposed by muscle force rather than passive loading by fat.
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